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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '96ed83ac7c50ae49b7ccf09f2707847bae83ee4e32ae06b1cfd261008963c189' 
  AND token = 'Md3fWf+OHATOsV8lqvGpIOdEA+Gg8P4u7AYlCc1Zyrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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