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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd11624d0de2945707a2879898879b5e210087c838400ff87016b70a3f89ecd4c' 
  AND token = 'LhcY3LhH7yNHaSNDrNWlS404fZXPkRSpQdr07fSAbNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00403

JSON explain

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