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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '661fdea3ea59e7b26e351582d87dfc0f655534c83cf0cac8ffb79425cab9b3c6' 
  AND token = '7/F8tJ0cIps2m1l2XHEumAxL83oO/K6aHwcdypwpe0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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