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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c84a3cb9975586ef4152e7099b7888993da85440df88a9f3cbe60b401ddc3ee6' 
  AND token = '9sck0Lth7U2L8goi6g2WQNzfVhu/zcMKrca88AmAJe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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