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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5d9b1e06e906ec1b4eb6405162771a1877cfec5a44e12e1400b8b67094546b67' 
  AND token = 'bq8GJF84o5Ih42t1y3ZR4CQSBmPZFirBMTfmU/yABgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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