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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'acebd3e13c3cb9798ad37f12993fe9f021a867c55c37a4b1903990e121168652' 
  AND token = 'cty7VHam4vKb8Iz5AbKuCAIR4jLDwKCl2Z6LX3/iO7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}