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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '13b053ecee34444ca4c54c00e9a6782370fbecbaff5d4b3ce28db2aa0e2005f5' 
  AND token = 'H3jESWLbJVJR4YSncyI/Ye0DwSla4sUBra0CbBrCZv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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