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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '96e4d853e548747b437620202459ad85ea682374a4a09773727409c2cbf15184' 
  AND token = 'W87OMiY8216rOh2uwldTSyZ6UVSgi1XTUF5KljUwJyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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