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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '26bfc92ab0fa7eff8d45fbefa01bff837702e2c3e60eb27e1517db5615a47b1c' 
  AND token = 'zYt4xZefSmVW/sAsUPVmF9NLETrl1IQY3vvLhL4ay2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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