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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '94e3b0d946ddf8c8a94da7614ec418977e0715805305166b877103e03305f7e8' 
  AND token = 'DE/27Jv7fcYdd5o5LrdMjHBM1gPRibPtcRneeMzrn5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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