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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8e44ee20006f0a38a56cf967744602db30a9be50f4fd8bb31ca655c68cdbfc4a' 
  AND token = 'yz8TluXVzJrpXGPgbIpidMhdztpTyg8KCbGQDdaXUJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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