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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1955021e29b98ea5f66201202f96efce14a7f52debd3aee03f0eb73e273bcdb8' 
  AND token = 'kW8FAJfCDWTL6o5Brf/Kdr99cvHTdT9iDOTFQwUDvm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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