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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ae1ec19c678a7992eb6f295e0646eca188cd63845d7dd939670957b28c09d6fe' 
  AND token = '/2w8M80ncSISGPBEAsbBhqPbhBrQxJ3/pXEaVkUNPi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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