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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd0316872fb4223401394383070de390e6b9b3e58ceb40fedd809c8eee84ad921' 
  AND token = '0vPWjl2p/H/8GEIfCAM7SaOX/RGtT790/y0MS4WQhTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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