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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0fdf022a7128f9cc6a3d4184f204325e4b678538199ea45694c3d060c5d482fb' 
  AND token = 'WYnmDd5bopR2HcHC2I8euP3EnhH3ZZCLW3iRs6uK2Ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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