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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9a075803bf690d96ae89447ac9909d948140e80d4f1e144910a32cb218e0dd69' 
  AND token = 'ogFk/GMMQmk7dmBgl3mivr7AxDO5mxCeO6rjihHCFlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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