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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'df2ce8b42e0576cd4ab5423a46fd33ce8067a09c3c07254ef7a7bbe6fbcc3062' 
  AND token = 'EH2ArvJjM8HolnFnZX7xsDe+f3R3PNs+EFfzR+SgJ1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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