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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5f815ee11b899472bd232ac70a82302b7f58187facebc970e3051d47f8095ac5' 
  AND token = 'Fk1ZWwkSQbE+PelWmWtCLr7xN+22+Q2Nv6bHR7vBdYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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