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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd1798fbd9fdbea99a7de916e76254e0b307b89b91f03b1b35ac879b9ae0814d7' 
  AND token = 'rEMguFrpNLAgQkLBcT8JF/n4r6HYj804yv6TyL3TiQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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