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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '128e18a2f76549f17253a730b086a2499c31a9ad3854eedbb5ef7bde949d769a' 
  AND token = 'eyS8bJa1+kMWX2eyyoCGWaIrzflOJW6PCuPcV9U4qu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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