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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c5dc5e06bd920135eab231925f0b689e988312d2d716e651baa98dae3a1b27dc' 
  AND token = 'XXchmK7Tjd0iAe3MOM7AztU0yrnXKcZCb+EJqfnho0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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