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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5b65c9b16c06baa05fa7d3f855da83719c2759ebb8cc214c962a33eab86d84ec' 
  AND token = 'Vc4BoP1rYjvE/Fgyp0NJdYMNX2gaexvQAIjQW/NTvvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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