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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7a418fbc1454fa3fb9ab0359527fa136edb550d439cb3bf48bd363d366366884' 
  AND token = 'i3Wb1CzNcrPBxdO4n/29CVVwhxntnknnWQVqzXbN6No=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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