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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'aab9160065b3eac4ad69fb0c5785e1530703f05ee7ee38d564697b3cd27f0e22' 
  AND token = 'osyLL61DS32LMhGXCV8GaF8SbX5JL68dtURPIgb4MVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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