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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0d5c6a8b0f1301676aa77edf7f9386de03a596013678428eddc94ef370b5321c' 
  AND token = '11/acjDnumEr9wQ5IHbvQLoTK4dMu8n7n9k90qWNW44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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