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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd8db2d0e257ed6ab5a3a8fde33b8a2e4a9b690e676e4ea797e41c6be89880407' 
  AND token = 'DvsWp+HrDXtWoqIrL5sqXHTExrbUjEC/MpPz1SKNU1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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