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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c2fc190669f119ea4e00cbbb7a543c1bfe149995265f465b4f32b1ca49727bd6' 
  AND token = '0iR4vQzD39YwUA6Eb/FD17MbsjRG9eagWCp3Y+49Cw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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