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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'eed4b664053ac3b459f3c889ae812725af21db3c5f9f6ec29148af0203af4f0b' 
  AND token = 'yoVSOA22i66S+KU1A/ILeaDmU1yP82VzNUz9pkF6LsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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