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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6dce55d12de04995033adc8f5ce070024b6f18a5dd08f8ce438f7f0b9e8cc722' 
  AND token = 'iB6oO6h+wJExV1nx9GbuPdMGyWPKB0AyQAnxEy5Mji8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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