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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6925c7aa5e79ad81712a22f74836154a7562c20b8ae05cec716d959a1df3e99e' 
  AND token = 'FEyfY0hTArd8F4Ha1Xa0Y8MNhPyLUvmtD5dElviaYZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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