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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '87791675f937c812671d01c50f4e878c7eb14beb697b48b1e6a8f2bfd94cc45f' 
  AND token = 'VI+aw8W0Yff8wMndZ9eO0yEDy13OHC0LFLQzUXfC7q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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