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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b7ae916a0b6be066a60bed0d6e0f11b42a3e97e6ce3f9adbc352d0be5e4f4b62' 
  AND token = 'ZsCeqA/9Kb8Q6UZhwC5y8WEZn/bPPMTmjyYM05qic5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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