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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a9ed3b92494f18fe72e772cc6083b5e4c0bc507969c194640d4896d07e72619f' 
  AND token = 'eP/qzlXu40LWLAQcM53kGqG+3UMtfsxUggqMHvNsCp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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