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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f16204ef6d1e77f0feec5dadc450148dbf29a74dc743602ec948aa71f5c18b1a' 
  AND token = 'yLT8CETA5rXm+8rAthOurd3oXyV/SCtTO4TR52dxDg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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