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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '27d5fa58ae62d3c50b91d61233a1ed5728d5e4f13d238384c935e2211638aaf7' 
  AND token = '9MArBArpS5L17gxapD0ozGgZqYK10dcvYeNBs0sFPiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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