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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6b637b807915760703f4dbe5d5adc4b737b027bf1e0a36040a1027101cab372a' 
  AND token = 'vem7mDl0yShbSbCrLEED1FaUD/LXgIT9s/mRL+REMJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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