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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8ac3f2bb53fab3e04fbb385a3d1ed0a8459af47721cbc4e891202196a5fb49fb' 
  AND token = 'o4Re+NTyYfKNfhSKUZnRyEuK1n+1a8NII0T/VcHjWM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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