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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '39ce6408f0d4b83fa40a34078973c4670825b72e7f173cc8c5127b17708315ef' 
  AND token = 'Wn8tp3L64IsDxi2saf8Dg64H63qLQOM0uOsf06lwsNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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