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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4a479e85e75d1fbe459040a2c3b7bf12b9aa48180b3481ba5cfe82962cf42ea1' 
  AND token = 'MvT0koZYWuiaV4AZidiPG81m2MXX2jMjc6E82gBkEQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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