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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3288cb2a12e76619ab432808e4473cb66a1f87f7e14c5eb1806b2aaaa7377721' 
  AND token = 'wJ45KHCmdrbAktvAgGb1HMMgwDNCmFvs+AonyA5oK/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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