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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '70f0e0713a3b91d038ecb4a2b12ef97970396361bbb6bb65925b8ffd382be942' 
  AND token = 'Twy4PxuZdE735Cf7Pe3K1V3j6QKchQqbjVt0/cnS+Ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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