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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '81445456d3cbfdd79ec6f0f40e25394f2fa6baa7d9015f171c508806290b98eb' 
  AND token = 'kWJWbd2rtRbEQ8xx4Iz4yXW42hJWfaLUbyUC6WQMN6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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