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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ce884a69bcbb94acd25b8a954320e064a0e20319aa6301d7e6fd374e8bdbacb6' 
  AND token = '5mCs2XPpMNNx96tPL19vInIp+GEsPbnGnEKI2p5mhAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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