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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'de43c95d55e2cc78a022fd8730faac7694382e72c97bf706fba43fcf7c2e955e' 
  AND token = '2cFtWioxWsy3GXuv8capAAmNzvtyHRLyJp6Q9sHL6p8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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