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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '31366dc60831cd159a79dc977a63311e71e404aaf694f811c7150db6cd5f9087' 
  AND token = 'ruR4x1EZvab2eI07kCUGlfkabhdmX/wB0aDaji2LhsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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