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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5ca253cec601ab237ba2a0084bba334721059605141305d4febebac59fee7844' 
  AND token = 'hC8WVRGGuWmLjtMWA9+VTG2Z1M26QZ8T7Z00yfwgsmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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