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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9ca451c30d5d61d6677be42dac2d24b23e1a76c4f62add236f90b6ee7b1c3d94' 
  AND token = 'Jw4CgMomJbamBLPSCi+5ztZ2apiT2KDSxpW3LxaUi9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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