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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '03742b4b53cf8213bf6e0b7bec437fe75816f178a72d8fefb118413bb68e6cda' 
  AND token = 'omNgsuHZG5EI/CcrPclSeLA20tIuF1rOfFIrJkqywS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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